Duplex valve applied to a single cylinder



mh 2, w27, W, J, WOODCOCK 2,072,325

DUPLEX VALVEA APPLIED'TO A SINGLE CYLINDER Original Filed Nov. 14, 19312 Sheets-Sheet l Mgrch 2, 1937. W. WOODCCK 2,72,325

DUPLEX VALVE APPLIED TO A VSINGLE CYLINDER Original Filed Nov. 14, 19312 Sheets-Sheet 2 Patented Mar. 2, 1937 .PATENT oFrlcl-zv DUPLEX VALVEAPPLIED TO A SINGLE CYLINDER Willard Jay Woodcock, BrooklynQN. Y.;Augusta A. Woodcock executrix of said Willard J. Woodcock, deceased,assignor to AugustaA. Woodcock, Brooklyn, N. Y.

Original application No No. 575,109. Divided May 26, 1933, Serial vember14, 193.1, Serial and this application 1 Claim. `(o1. 121-150) Thisinvention relates to a valve to reliably operate a single cylinder, witha reciprocating piston, to reverse when the piston becomes stalled.

The present method, is to operate the valve of a single cylinder with areciprocating piston, by

connecting it to the piston rod.

It is evident, that when the piston rod becomes stalled, that themachine will cease to work, and therefore impractical for some service,especially for a domestic stoker.

The objects of this invention are to produce a more reliable valve forsingle cylinders in general to produce a valve that will operate asingle cylinder, with a reciprocating piston that will reverse when thepiston becomes stalled; reversing the piston generally releases thecause of obstruction, which falls out or if the nature of a clinker willbe crushed, after a few impulses of a ram, and then resume its operationwithout attention.

In other words it does not require service, which is quite necessary fordomestic equipment. This desirable result, can be accomplished assubsequently shown.

The method of obtaining these results is illus- 25 trated in theaccompanying drawings.

Fig. 1 is a sectional elevation of the right side `of the duplex Valve.

Fig. 2 is a sectional elevation of the left side of the duplex valve.

Fig. 3 is a cross section of the duplex valve through 3 3, Fig. 2, andshows the piston chambers, the working cylinder, and port connection tothe same, only the port from the left side of the valve connects to theworking cylinder.

Fig. 4 is a cross section through 4-4, Fig. 2, and shows the valve bodywith cross over arrangement of levers and rockshafts whereby the rightside piston operates the left side valves, and the left side pistonoperates the right side Valves.

Fig. 5 is a plan of the valve seats and ports of the duplex valve. Adescription of this duplex valve in which all numerals refer to likeparts is as follows:

Reference being made to Figures 1 and 2, in which Fig. l is the rightside and Fig. 2 is the left side of the valve and as they interconnectthey can best be described jointly. 23 is a working cylinder with areciprocating piston rod 2l, to which is fast the piston 32, a tail rod33, makes a complete unit and no crosshead and ways are necessary. 34 isa case which encloses the valve body 35, which is provided with pistonchambers 6|, 6|' Fig. 3, in which reciprocate piston 36 on the leftside, and piston 36', on the right side, the 55 cover 5|] includes theport 60, and inlet connection 5|, and covers all the valve chests 31,3l', 63, 63' as shown 'in Fig. 5, and Vin which the slide valves 38,38', 53, 53' work, and the pressure ports in the valve seats are shown,42, 42', 54, 54 and also the exhaust ports 49, 49', 55, 55". The valves38, 38 are attached to valve rod 39, and the valves 53, 53 are attachedto the valve rod 39', on the right side, the lever 40, is fast to therockshaft 58, and also lever 56 as is shown in Fig. 4, and lever 51, isfast to the rockshaft 59, as is also lever 4|, this makes the cross overso that the left side piston 36, operates the right side valves 53, 53',and the piston 36', on the right side operates the left side valves 38,38. 4l, is a resistance spring on the left side, 46 is a spring leverwith the angle block 45 fast on it, and 44 is a cross head fast on thepiston 36. These blocks must pass each other before the piston 36 cancomplete its travel and overcome the tension of the spring lll, thissame arrangement is also on the right side, 4l', 46', 45', 44 andperforms the same work.

Having thus described the device the operation is as follows:

Pressure enters the valve at 5|, Fig. 2, from any suitable source andpasses through port 60, to supply pressure chests 3l, 37', Fig. 2, andalso pressure chests 63, 63' Fig. 1.

In Fig. 2 the valves 38, 38' are at the extreme travel towards A andport 42 will be open, admitting pressure to pass the end of piston 36and pass through the port 43', to the working cylinder 23, and againstpiston 32, and forces it to the end of the stroke towards A. As shown ithas reached the end of its stroke and the pressure has built up until ithas forced piston 36, to the center of its stroke towards A and now itwill soon finish. In doing this the lever 4|, Fig. 2, engaged with thepiston 36, and is fast to the rockshaft 53, below the valve stems 39,39', the rockshaft 59, is also fast to the lever 5l, Fig. l, and engageswith valve rod 39', to which valves 53, 53 are attached, and when piston36, Fig. 2 is at the end of its movement towards A the Valves 53, 53'Will be at the end of their movement towards B opening port 54.

The pressure will now be admitted at the end of piston 36', and move itup to the resistance at angle block 45' and cross head 44.

As the right side of Figure 1 does not connect to the working cylinder23, the pressure quickly builds up and overcomes the resistance. ofspring 4l' by means of the spring lever 46 to which angle block 45' isfast, and contacting with 44', which is fast to piston 36', whichcontinues its 36 and moved with it and lever 40 on the same rock-shaft,and engages with the valve rod 39,

.on the left side of Figure 2. The valves 38-38.

are attached to this valve rod. As rook-shaft 58 is located above thevalve rods 35i-39', the valve stem 39 travels in the same direction aspiston 36' on the right side of Figure 1. Therefore, when the piston 36'is at its full stroke towards B, the valves 38-38 on the left side ofFigure 2, will also be at their extreme travel towards B. When in thisposition the port 42 will be open and pressure will pass by the end ofpiston 36, and through port 43, into the working cylinder 23, and forcethe working piston 32 towards B. And then the pressure will build up andforce piston 36 .over the resistance caused by spring 41 and to the endof its stroke towards B. The case 34 covers the entire duplex valve andforms a reservoir. The exhaust from valves 38-38 on the left side ofFigure 2 exhaust through ports 49-49 into this case, and on the rightside of Figure 1 the valves 53-53 exhaust through ports 5'5-55' intothis same case. Therefore, there is a pipe connection in the case at 52Figure 2 to carry away the total exhaust from the duplex valve.

There are many uses to which this Valve may be applied and I do notlimit myself to this form of construction.

The introduction of a resistance in the duplex valve principle producesa new result in mechanical movement.

Having thus described my invention,

What I claim as new is:

In a valve device for a power circuit consisting of a casing, aplurality of chambers therein, each of said chambers provided withports, a plurality of piston members to work in said chambers, valvemeans operable by number one piston member to open and close number twochamber ports, and valve means operable by number two piston member toopen and close number one chamber ports, resistance means applied tosaid piston members, which must be overcome by pressure, before a pistonmember can complete its stroke.

WILLARD JAY WOODCOCK.

